- From: Simon K Johnston <skjohn@us.ibm.com>
- Date: Mon, 20 Jul 2009 20:13:21 -0400
- To: Ivan Herman <ivan@w3.org>
- Cc: W3C SPARQL Working Group <public-rdf-dawg@w3.org>, public-rdf-dawg-request@w3.org
- Message-ID: <OF2C00BC1E.AA005240-ON852575FA.00006A6A-852575FA.0001390F@us.ibm.com>
As mentioned in the minutes I had mentioned last week that in trying to work through the details of MINUS and UNSAID I wonder if one way to get ourselves unstuck is to look at and document some use cases. We do already have NOT EXISTS in SQL (and XQuery) and these are well known and used today so one might ask what they are used for, what queries require these capabilities? For example we might be able to come up with a set of simple queries, expressed in natural language, that we can then evaluate the two proposals against. For example, "find me all records where no due date has been set" seems to map well to UNSAID, but seems more clumsy when expressed with MINUS - or rather the natural expression seems harder to read in the resulting SPARQL. Thanks, Simon K. Johnston (skjohn@us.ibm.com) - STSM, Jazz Foundation Services Mobile: +1 (919) 200-9973 Office: +1 (919) 595-0786 (tie-line: 268-6838) Blog: http://www.ibm.com/developerworks/blogs/page/johnston From: Ivan Herman <ivan@w3.org> To: W3C SPARQL Working Group <public-rdf-dawg@w3.org> Date: 07/15/2009 05:49 AM Subject: Minutes of yesterday's meeting Minutes have been uploaded to: http://www.w3.org/2009/sparql/meeting/2009-07-14 Unfortunately, I forgot to run RRSAgent during the meeting, so I had to massage my IRC client logs to make it usable with Sandro's script. I hope nothing went wrong in the process. Sorry about that. Ivan -- Ivan Herman, W3C Semantic Web Activity Lead Home: http://www.w3.org/People/Ivan/ mobile: +31-641044153 PGP Key: http://www.ivan-herman.net/pgpkey.html FOAF: http://www.ivan-herman.net/foaf.rdf
Received on Tuesday, 21 July 2009 00:14:03 UTC